Helmitheros vermivorum

Order

Family

Code 4

Code 6

ITIS

ILLUSTRATION

PHOTOS

CONSERVATION STATUS

The Worm-eating Warbler has an enormous range reaching up to roughly 1.8 million square kilometers. This bird can be found in a majority of Central America and the Caribbean as well as North American areas. This species prefers forested locations in temperate and subtropical or tropical regions. The global population of this bird is estimated to be around 750,000 individuals. Currently, it is not believed that the population trends for this bird will soon approach the minimum levels that could suggest a potential decline in population. Due to this, population trends for the Worm-eating Warbler have a present evaluation level of Least Concern.

SUMMARY

Overview

Worm-eating Warbler: Medium-sized, ground nesting warbler with olive-gray upperparts and pale yellow underparts. Yellow head has black crown stripes and eye-lines. As its name suggests, it eats a steady diet of moth caterpillars and worms. It usually forages in understory vegetation and dead leaves.

Range and Habitat

Worm-eating Warbler: Breeds from southeastern Iowa, across the Ohio Valley, into the Mid-Atlantic states and southern New England, ranging into the southern states. Spends winters in the tropics from central Mexico, the Yucatan Peninsula, and the West Indies to areas south. Dry, wooded hillsides are the preferred habitat of this species.

Worm-eating Warbler SONGS AND CALLS

Worm-eating Warbler A1

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Song is a high-pitched trill.

Worm-eating Warbler A2

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Call is a repeated "tseet".

Similar Sounding

Chipping Sparrow B1

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Song is a thin musical trill, all on one pitch.

Dark-eyed Junco E2

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Song is a musical trill, all on one pitch ("Oregon" group).

Voice Text

"chip", "tseet"

INTERESTING FACTS

The Worm-eating Warbler was first described in 1789 by Johann Friedrich Gmelin, a German naturalist, botanist and entomologist.

Despite its name, it only rarely, if ever, eats earthworms. Instead, it feeds mostly on caterpillars, which were once referred to as worms.

Late in incubation the female sits so tight on her nest that only touching her will flush her. Her cryptic coloring makes immobility a safe strategy.

A group of warblers has many collective nouns, including a "bouquet", "confusion", "fall", and "wrench" of warblers.

SIMILAR BIRDS

RANGE MAP NORTH AMERICA

About this North America Map

This map shows how this species is distributed across North America.

FAMILY DESCRIPTION

Wood-Warblers (Parulidae)

ORDER

The wood-warblers are one of the one hundred eighteen families of birds in the order PASSERIFORMES (pronounced pas-ser-i-FOR-meez); a large taxonomic order that includes other small perching birds such as the vireos, the white-eyes, and the tanagers.

FAMILY TAXONOMY

The wood-warblers, or Parulidae (pronounced pah-ROO-luh-dee), are a large family of one hundred and twenty-two species in twenty-six genera that only occur in North and South America.

NORTH AMERICA

North America has ninety species of wood-warblers in twenty-six genera; included in this family are the yellowthroats, a seemingly dizzying array of warblers, and the waterthrushes.

KNOWN FOR

The wood-warblers are known for their colorful plumages – the Blackburnian Warbler being one of the most striking members of this family with its deep orange-red throat that contrasts with its handsome black and white plumage. However while many species are known for their beautiful breeding plumage colors, they are also known to bird watchers as being extremely challenging to identify when in the fall they revert to their drab tan, olive, and pale colored plumages.

PHYSICAL

Like several other Passerines, the wood-warblers are small birds with medium length tails, medium length legs and strong feet suited to perching. They have short to longish wings (in migratory species), and medium length, thin, pointed bills.

COLORATION

Members of the Parulidae come in a variety of colors. Different shades of yellow and olive occur in many species, including the dull, brown, streaked plumages of females and immatures. In addition to having bright yellow in their plumages, males in bright breeding plumage can show orange, blue, grays, and handsome patterns of black and white.

GEOGRAPHIC HABITAT

The wood-warblers occur throughout North America except for the far northern tundra. The many species of this family have evolved to fill a wide variety of niches including marshes (yellowthroats) to tree trunks (the Black-and-white Warbler), and spruce forests (the Cape May Warbler). Several species can reside in the same area, yet avoid competition by occupying slightly different habitats or feeding in different ways.

MIGRATION

Most species of wood-warblers are long distance migrants to Central and South America.

HABITS

Members of the Parulidae are not colonial nesters but often occur in mixed flocks with other species after the breeding season. They forage in a variety of ways for invertebrates, small fruits, and nectar. While the waterthrushes forage on the ground in streams and wetlands, and the Black-and-white Warbler creeps along tree trunks, most wood-warblers glean the vegetation of trees and bushes and make short sallies for their insect prey.

CONSERVATION

The Kirtland’s Warbler is an endangered species restricted to a very specific type of habitat mostly found in Michigan; Jack Pine forests. Its habitat is managed for this species in a few national forests by ensuring that there are Jack Pine stands of the age and composition this species requires. Brown-headed Cowbird populations are also controlled on its breeding grounds.

INTERESTING FACTS

The Bachman’s Warbler is an enigmatic species considered to be extinct by most authorities although slim hopes for its continued existence are kept alive by a few possible sightings over the last thirty years. Historically occurring in the southeastern United States, this little known species is thought to have been dependent upon canebrakes on its breeding and wintering grounds in Cuba. Although the reasons for its decline are unknown, destruction of these canebrakes is the most likely reason for its demise.